The Spyglass.
"A report reached my ears that a certain Fleming had constructed a spyglass...Upon hearing the news, I set myself to thinking about the problem...Finally, sparing neither labor nor expense, I succeeded in constructing for myself so excellent an instrument that objects seen by means of it appeared nearly one thousand times larger and over thirty times closer than when regarded with our natural vision." Galileo Galilei
Image: Galileo's telescope.
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